Common symptoms include:

• Tingling or burning sensations.

• Numbness in the hands and feet.

• Sharp or shooting pain.

• Muscle weakness.

• Reduced sensitivity to temperature.

• Difficulty maintaining balance.

Diabetes is a major cause of peripheral neuropathy, but other factors can also contribute.

These include vitamin B12 deficiency, excessive alcohol consumption, certain medications, infections, autoimmune diseases, kidney disorders, and nerve compression.

Some neurological conditions can produce symptoms that resemble poor circulation, making accurate diagnosis particularly important.

For example, someone with a compressed nerve in the lower back may experience tingling or pain extending down one leg into the foot.

In such cases, improving arterial blood flow will not necessarily resolve the problem.

Persistent numbness, burning, or weakness should be assessed to determine whether the underlying issue involves blood vessels, nerves, or both.

4. Smoking and Tobacco Use

Smoking is one of the most significant preventable risk factors for vascular disease.

Cigarette smoke contains substances that damage blood vessel walls, promote inflammation, and interfere with normal vascular function.

Nicotine can also cause blood vessels to constrict temporarily, reducing blood flow to certain tissues.

Over time, smoking contributes to atherosclerosis, increases the risk of blood clots, and damages the cardiovascular system.

The effects are particularly concerning in people who already have diabetes, high blood pressure, or elevated cholesterol.

Smoking increases the likelihood of developing peripheral artery disease and makes existing disease more difficult to manage.

People with PAD who continue smoking face a higher risk of cardiovascular complications and serious problems affecting their limbs.

The NHLBI identifies smoking as a major risk factor for peripheral artery disease and emphasizes smoking cessation as an important part of prevention and treatment.

Quitting smoking can improve vascular health and reduce the risk of heart attack, stroke, and further arterial damage.

Avoiding secondhand smoke is also beneficial.

For people who find quitting difficult, professional support, behavioral counseling, and approved smoking-cessation medications can improve the chances of success.

5. Thyroid Disorders

The thyroid gland produces hormones that regulate metabolism, energy use, body temperature, and several other physiological processes.

When thyroid hormone production becomes abnormal, multiple body systems can be affected.

Hypothyroidism occurs when the thyroid gland produces insufficient amounts of thyroid hormones.

Common symptoms include:

• Fatigue and reduced energy.

• Increased sensitivity to cold.

• Dry skin.

• Hair thinning or hair loss.

• Weight gain.

• Constipation.

• Slower heart rate.

• Muscle aches and weakness.

Some of these symptoms can resemble those associated with poor circulation.

Hyperthyroidism, in contrast, occurs when the thyroid gland produces excessive amounts of thyroid hormones. It can cause palpitations, sweating, heat intolerance, anxiety, and changes in body weight.

Thyroid disorders may also affect cardiovascular function, including heart rate and blood pressure.

However, cold hands and feet in someone with hypothyroidism do not necessarily mean that their arteries are blocked.

If circulation-like symptoms occur alongside persistent fatigue, unexplained weight changes, changes in hair growth, or unusual sensitivity to temperature, a doctor may recommend thyroid function testing.

6. Peripheral Artery Disease

Peripheral artery disease is one of the most important causes of poor arterial circulation.

It occurs when arteries supplying the limbs become narrowed or blocked, usually because of atherosclerosis.

Atherosclerosis develops gradually as cholesterol, fatty substances, inflammatory cells, and other materials accumulate within arterial walls.

These deposits form plaque, which reduces the space available for blood to flow.

As the narrowing becomes more severe, the affected tissues receive less oxygen-rich blood.

Although PAD most commonly affects the legs, it can also involve arteries supplying other parts of the body.

Common symptoms include:

• Leg pain during walking.

• Cramping in the calves or thighs.

• Coldness in the feet.

• Numbness or weakness.

• Reduced hair growth on the legs.

• Changes in skin color.

• Slow-healing wounds on the feet or toes.

• Weak pulses in the affected limb.

Some people have no obvious symptoms, which is one reason PAD can remain undiagnosed.

The Centers for Disease Control and Prevention (CDC) explains that PAD is associated with an increased risk of heart disease and stroke because the same underlying atherosclerotic process can affect multiple arteries.

The condition should therefore be regarded as an important indicator of overall cardiovascular health rather than simply a problem involving the legs.

7. Raynaud's Phenomenon

Raynaud's phenomenon is a condition in which small blood vessels, particularly those supplying the fingers and toes, narrow temporarily.

The attacks are often triggered by cold temperatures or emotional stress.

During an episode, the affected fingers or toes may become:

1. White because blood flow is reduced.

2. Blue because of changes in oxygen levels in the blood.

3. Red when circulation returns.

Not everyone experiences all three stages.

Other symptoms include numbness, tingling, discomfort, and a sensation of coldness.

There are two main forms of Raynaud's phenomenon.

Primary Raynaud's occurs without an identifiable underlying disease. It is generally less severe and is often manageable through lifestyle adjustments.

Secondary Raynaud's occurs in association with another medical condition, such as certain autoimmune or connective tissue disorders. It can be more serious and may cause skin sores or tissue damage.

According to the National Institute of Arthritis and Musculoskeletal and Skin Diseases, avoiding cold exposure, keeping the whole body warm, managing stress, and avoiding nicotine can help reduce attacks.

People experiencing frequent, severe, or unusually painful attacks should seek medical advice.

8. Blood Clots

Blood clots are another possible cause of restricted blood flow.

Blood clotting is normally a protective process that prevents excessive bleeding after an injury. However, clots can sometimes form inside blood vessels when they are not needed.

A clot developing in a deep vein is called deep vein thrombosis (DVT).

DVT most commonly affects the legs, although it can also occur in other areas.

Risk factors include:

• Prolonged immobility.

• Recent surgery.

• Hospitalization.

• Certain cancers.

• Pregnancy and the period after childbirth.

• Estrogen-containing medications.

• Previous blood clots.

• Certain inherited clotting disorders.

• Older age and obesity.

A DVT may cause swelling, pain, tenderness, warmth, and skin discoloration in the affected limb.

The greatest danger occurs when part of the clot breaks away and travels through the bloodstream to the lungs.

This causes pulmonary embolism, a potentially life-threatening condition.

Warning signs include sudden breathlessness, chest pain that becomes worse when breathing deeply, a rapid heartbeat, coughing up blood, dizziness, or fainting.

The CDC stresses that suspected DVT requires prompt medical assessment and suspected pulmonary embolism requires immediate emergency treatment.

Blood clots should never be treated at home with massage or attempts to stimulate circulation.

9. High Blood Pressure

High blood pressure, or hypertension, places persistent mechanical stress on the walls of the arteries.

Over time, this can contribute to vascular damage, arterial stiffness, and the development of atherosclerosis.

Hypertension is also an important risk factor for coronary artery disease, stroke, kidney disease, and heart failure.